| The prestressed concrete continuous rigid frame bridge with the advantages of its simple appearance,beautiful bridge navigation space,linear smooth,mature of construction experience,it has become one of the main bridge at the span between 60 m and 150 m.The main construction method of continuous rigid frame bridge is cantilever placement or cantilever assembly,which is beneficial for crossing the valley,river and cross line traffic environment.The construction of long-span prestressed concrete continuous rigid frame bridge with cantilever casting method will add new design and construction experience to bridge construction in China,and will also promote the development of bridge design and construction technology.For the cantilever construction of the segmental cantilever construction of prestressed concrete continuous rigid frame bridge.The construction monitoring is to calculate the construction phase according to the real value of the structural parameters obtained from the construction monitoring.Identify each cantilever segment formwork elevation,and in the process of construction according to construction monitoring results of error analysis,and forecast for the next model elevation adjustment.In this way,the relative deviation of the two cantilever end elevation is not greater than the specified value and the internal force state of the structure meets the design requirements after the bridge.Based on the project of Baling River Bridge,combined with Midas/Civil software,the line,temperature and stress in the construction monitoring of the bridge are studied.The main contents and results are as follows:(1)Analyzed the development of continuous rigid frame bridge and its structural characteristics,and combine with the construction monitoring status and development trend of continuous rigid frame bridge both at home and abroad.Discuss the main methods used in the construction monitoring and the main factors affecting the construction monitoring.Point out the importance and necessity of construction monitoring for continuous rigid frame bridge.(2)The construction process of the Baling River Bridge is simulated and analyzed by using the finite element software MIDAS/Civil of the bridge specialty.Through boundary condition,self weight,construction load,prestress load,elastic modulus,temporary construction load and other parameters,simulation and identification is carried out to guide bridge construction successfully.(3)For linear control of main girder,this paper uses the grey system theory,according to comparing the theoretical value and actual monitoring data,error analysis,by giving the corresponding beam at each construction stage elevation model,adjust the actual elevation step by step,the main girder closure successfully,reach the design elevation.(4)For the stress control,the stress and temperature control in the main girder cross-section,the corresponding data of each construction condition,the stress calculation of shrinkage and creep and temperature,and separated it from the measured value,to calculate the actual girder stress caused by load,through the adjustment to meet the relevant requirements. |
